* {
   
    padding: 0;
    margin: 0;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-image: linear-gradient(to top, #d0ffae,#34ebe9);
}

ul {
    position: relative;
    display: flex;
    height: 200px;
    list-style-type: none;
}

ul::after{
    content: '爱心砰砰跳';
    position: absolute;
    top: -100%;
    left: 50%;
    color: rgb(26, 127, 221);
    font-size: 30px;
    font-weight: 700;
    transform: translate(-50%,-70%);
}
li {
    /* 定义元素间的宽度 */
    width: 20px;
    height: 20px;
    border-radius: 10px;
    margin: 0 10px;


}

li:nth-child(1) {
    background-color:red;
    animation: love1 4s 0s infinite;
}
li:nth-child(2) {
    background-color:rgb(0, 204, 255);
    animation: love2 4s 0.2s infinite;
}
li:nth-child(3) {
    background-color:rgb(224, 164, 108);
    animation: love3 4s 0.4s infinite;
}
li:nth-child(4) {
    background-color:rgb(214, 75, 140);
    animation: love4 4s 0.6s infinite;
}
li:nth-child(5) {
    background-color:yellow;
    animation: love5 4s 0.8s infinite;
}
li:nth-child(9) {
    background-color:red;
    animation: love9 4s 1.6s infinite;
}
li:nth-child(8) {
    background-color:rgb(0, 204, 255);
    animation: love8 4s 1.4s infinite;
}
li:nth-child(7) {
    background-color:rgb(224, 164, 108);
    animation: love7 4s 1.2s infinite;
}
li:nth-child(6) {
    background-color:rgb(214, 75, 140);
    animation: love6 4s 1s infinite;
}
@keyframes love1 {
30%,50% {
    height: 60px;
    transform:translateY(-30px);
}
70%,100% {
    height: 20px;
    transform: translateY(0);
}
}
@keyframes love2 {
    30%,50% {
        height: 125px;
        transform:translateY(-60px);
    }
    70%,100% {
        height: 20px;
        transform: translateY(0);
    }
    }
@keyframes love3 {
        30%,50% {
            height: 180px;
            transform:translateY(-90px);
        }
        70%,100% {
            height: 20px;
            transform: translateY(0);
        }
        }
@keyframes love4{
            30%,50% {
                height: 180px;
                transform:translateY(-75px);
            }
            70%,100% {
                height: 20px;
                transform: translateY(0);
            }
        }
@keyframes love5 {
                30%,50% {
                    height: 200px;
                    transform:translateY(-40px);
                }
                70%,100% {
                    height: 20px;
                    transform: translateY(0);
                }
                }
@keyframes love6 {
                    30%,50% {
                        height: 180px;
                        transform:translateY(-75px);
                    }
                    70%,100% {
                        height: 20px;
                        transform: translateY(0);
                    }
                    }
@keyframes love7 {
    30%,50% {
    height: 180px;
    transform:translateY(-90px);
                        }
                        70%,100% {
                            height: 20px;
                            transform: translateY(0);
                        }
                        }
@keyframes love8 {
                            30%,50% {
                                height: 125px;
                                transform:translateY(-60px);
                            }
                            70%,100% {
                                height: 20px;
                                transform: translateY(0);
                            }
                            }
@keyframes love9 {
    30%,50% {
    height: 60px;
    transform:translateY(-30px);
    }
    70%,100% {
    height: 20px;
    transform: translateY(0);
                            }
                                }